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since you guys have dived into those two concepts, here's fang for today...
the concept of thrust is represented by fang. thrust is actually also pretty tricky and i'm thinking that all of these concepts can so easily relate to another that it is no wonder that you really need all 8 (technically 7) to understand gravity and how to oppose it. the branching corrollaries are acceleration and shockwaves/shock. generally, gravity isn't really something we feel at all, but we can feel the 'drag' (resistance) when moving in a direction.
acceleration corrollary: defined as the rate of change velocity with time, which can be either speeding up or slowing down. in the easiest explanation, speed. thrust in and of itself is about speed but is specific to a single direction that is in opposition of the system (for example: going against direction of the wind). acceleration can be felt in any circumstance that involves motion, with the exception of 'free fall' in the absence of air resistance (one feels weightless because they can't feel the acceleration).
shockwaves/shock corrollary: defined as a propagating disturbance by sudden acceleration/deceleration. i really don't know how to fluff this idea out but the easiest example is crack of a whip (creates a mini shockwave/sonic boom) or how vehicle breaks the sound barrier - the most obvious evidence of a shockwave is the sound that is created when punching through a medium (including gas/air). an interesting note about shockwaves is that the energy created from an occurence is not lost though how it affects other parts/systems can create a strain.
these concepts are surprisingly well displayed in fang tricks, though it does ties into how the thorn tricks work too...
that doesn't really fit into how falco was around and he had fang tricks but was definitely not the child of gazelle...
^Exactly. "Fang" and "Thorn" are both part of the Sky Regalia, their runes were always part of the Rune Futhark with the eight bars (that needs nine to be complete). Fang and Thorn are both part of the original eight "powers" of the Regalia. It wouldn't make any sense for "Fang" to be an offspring of "Thorn". Not to mention, Gazelle did refer to the Fang as Falco's Trick when she was practicing how to produce Fangs. It's not like she came up with those Tricks on her own or anything. Also notice how Lind was able to combine "Thorn" and "Fang" into one Trick and create a "Fang" and "Thorn" hybrid Trick.